Tolong dong nomer 20-23,25-28please tolong dijawab butuh banget nih

23) A. 324

25) 180° = <A + <B + <C                 
      180° =  3x + 2x + x                    
      180° = 6x
        30° = x

      <B = 2x
           = 2 x 30
           = 60°